Michael Moore releases anti-Trump film

Documentary maker Michael Moore is releasing an anti-Donald Trump movie as Hollywood ramps up efforts to support Democratic White House contender Hillary Clinton.

Moore, the Oscar-winning maker of documentaries about guns, the Iraq war and the US health system, said on Twitter he would release Michael Moore in Trumpland in a free screening in Manhattan on Tuesday night, followed by a wider release on Wednesday.

It comes three weeks before the November 8 election, and is described as the "film Ohio Republicans tried to shut down".

In the movie, "Moore dives right into hostile territory with his daring and hilarious one-man show, deep in the heart of TrumpLand in the weeks before the 2016 election".

The film is based on a one-man show, October Surprise, that Moore, a vocal critic of the Republican presidential contender, recently performed in Ohio.

Moore ushered in a whole new era of partisan-charged documentaries in 2004, when his film Fahrenheit 9/11 became a box office hit.

His latest film is being released as scores of celebrities rally around Clinton before the November 8 election.

More than 30, including Barbra Streisand, Billy Crystal, Julia Roberts, Helen Mirren and Lena Dunham, staged a fundraising show on Broadway on Monday with tickets that sold for up $US10,000 ($A13,000) each and which was streamed live online.

Singer Jennifer Lopez and rocker Jon Bon Jovi will play separate Get Out The Vote gigs in Florida next week on behalf of Clinton's campaign.